Charity appeals normally conjure up images of bucket rattling at village fetes or glitzy gala dinners where the great and the good can display their largesse.
But the UN has a more ambitious request: one supertanker, slightly used, that it can use to stop an impending environmental catastrophe off the coast of Yemen.
The FSO Safer, a giant supertanker moored off the west coast near the entrance to the Red Sea, has long been a ticking time bomb.
